The WP-NOTCAPTCHA plugin for WordPress, versions up to 1.3.1, contains a reflected Cross-site Scripting vulnerability due to improper input neutralization during web page generation. This allows an attacker to craft malicious input that is reflected in the web page without proper sanitization, potentially enabling script execution in the victim's browser. The CVSS 3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability.

Successful exploitation can lead to execution of arbitrary scripts in the context of the affected website, potentially allowing attackers to steal user credentials, perform actions on behalf of users, or disrupt availability. The CVSS vector indicates limited but real impacts on confidentiality, integrity, and availability. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider disabling or replacing the WP-NOTCAPTCHA plugin to mitigate risk. Implementing web application firewall (WAF) rules to detect and block reflected XSS attempts may provide temporary protection.